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Physics [1 Mark Question Answer]

Simple Machines · ICSE STD 10 (ICSE - English Medium). 27 questions.

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[1 Mark Question Answer]

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27 questions · timed · auto-graded

Question 11 Mark
There is no gain in mechanical advantage in the case of a single fixed pulley. Explain, why the pulley is then used?
Answer
It is used only to change the direction of effort to a more convenient direction and to use one’s own weight for the effort.
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Question 21 Mark
Name a machine which can be used to multiply force and change the direction of force applied.
Answer
Nutcracker and Hand Pump.
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Question 31 Mark
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
Answer
Efficiency $=\frac{\text { Mechanical advantage }}{\text { Velocity ratio }} \times 100$
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Question 51 Mark
Give an example where a machine is used to obtain gain in speed.
Answer
In automobiles, gear arrangement system (machine) is used to obtain gain in speed.
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Question 211 Mark
A type of single pulley is very often used as a machine even though it does not give any gain in mechanical advantage. For what purpose is such a pulley used?
Answer
Drawing water from well.
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Question 221 Mark
A type of single pulley is very often used as a machine even though it does not give any gain in mechanical advantage. Name the type of pulley used.
Answer
Single fixed pulley.
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Question 231 Mark
Which class of lever found in the human body is being used by a boy when he raises the weight of his body on his toes?
Answer
Class II lever.
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Question 241 Mark
Which class of lever found in the human body is being used by a boy when he holds a load on the palm of his hand.
Answer
Class III lever.
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Question 251 Mark
Give an example of the following use of a machine to change the direction of force.
Answer
Lifting a bucket full of water from the well using a single fixed pulley.
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Question 261 Mark
Give an example of the following use of a machine to obtain gain in force.
Answer
Lifting a car with a jack.
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Question 271 Mark
Give an example of the following use of a machine to change the point of application of the force.
Answer
Rotating the wheel of a cycle by applying force on the paddle with the help of a chain.
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[1 Mark Question Answer] - Physics STD 10 Questions - Vidyadip